参数资料
型号: AT83C5112
厂商: Atmel Corp.
英文描述: 8-bit Microcontroller with A/D Converter
中文描述: 8位微控制器与A / D转换器
文件页数: 37/97页
文件大小: 1229K
代理商: AT83C5112
37
AT8xC5112
4191B
8051
04/03
pins (Figure 12). To prevent bus conflicts on the MISO line, only one slave should be
selected at a time by the Master for a transmission.
In a Master configuration, the SS line can be used in conjunction with the MODF flag in
the SPI Status register (SPSTA) to prevent multiple masters from driving MOSI and
SCK (See Error Conditions).
Baud Rate
In Master mode, the baud rate can be selected from a baud rate generator which is con-
troled by three bits in the SPCON register: SPR2, SPR1 and SPR0. The Master clock is
chosen from one of seven clock rates resulting from the division of the internal clock by
2, 4, 8, 16, 32, 64 or 128, or an external clock.
Table 30 gives the different clock rates selected by SPR2:SPR1:SPR0:
Table 30.
SPI Master Baud Rate Selection
SPR2:SPR1:SPR0
Clock Rate
Baud Rate Divisor (BD)
000
F
CkIdle
/2
2
001
F
CkIdle
/4
4
010
F
CkIdle
/8
8
011
F
CkIdle
/16
16
100
F
CkIdle
/32
32
101
F
CkIdleH
/64
64
110
F
CkIdle
/128
128
111
External clock
Output of BRG
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